Jamaican style ginger cake

Name: Jamaican style ginger cake
Prep time: 10 min
Cook time: 1 h 20 min
Total time: 1 h 20 min
Yield: 12 portions
Ingredients: 125 g unsalted butter; 250 g self-raising flour; 40 g crystallised ginger; 125 g dark brown sugar; 140 g golden syrup; 100 g treacle; 1 tbsp ground ginger; 1 tsp ground cinnamon; 1 tsp mixed spice; 1 tsp bicarbonate of soda; 1 pinch sea salt; 240 g full cream milk; 2 eggs; icing sugar